import os

if __name__ == '__main__':
    choice = input("请输入'加减乘除'来获取对应的口算本\n例如(加):")
    if choice == '加':
        os.system('py -3 tools/+.py')
    elif choice == '减':
        os.system('py -3 tools/-.py')
    elif choice == '乘':
        os.system('py -3 tools/x.py')
    elif choice == '除':
        os.system('py -3 tools/÷.py')